// Copyright 2013 M-Lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// +build appengine

// The ns package provides the mlab-ns2 functionality.
package ns

import (
	"appengine"
	"net/http"
)

import _ "appengine/remote_api"

const (
	URLRoot = "/"
)

func init() {
	http.HandleFunc(URLRoot, root)
}

func root(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)
	header := w.Header()
	header.Set("Access-Control-Allow-Origin", "*")
	header.Set("Content-Type", "text/html")
	if r.Method == "OPTIONS" {
		header.Set("Access-Control-Allow-Methods", "GET")
		header.Set("Access-Control-Allow-Headers", "Content-Type")
		header.Set("Access-Control-Max-Age", "86400")
		return
	}

	_, err := w.Write([]byte(r.RemoteAddr))
	if err != nil {
		c.Errorf("root:w.Write: %v", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}
